As 72-ft-dia rotor blades spin overhead, a fearless crew of specialized workers perches atop the four legs of a half-erected communications tower at a desolate mountaintop site, ready to receive the next section of tower. As far as the eye can see, there are no roads, no buildings, no other people. Above, a heavy-lift helicopter, nicknamed Annie, hovers, with her pilots methodically lowering the 18,000-lb payload down toward the workers, aiming to precisely mate the new tower section with the previous one. Once everything falls into position...